static LongTreeSet longTreeSetWithComparator(Comparator<Long> comparator) {
  ret new LongTreeSet {
    public int compare(long a, long b) {
      ret comparator.compare(a, b);
    }
  };
}

ifclass LongComparator
static LongTreeSet longTreeSetWithComparator(LongComparator comparator) {
  ret new LongTreeSet {
    public int compare(long a, long b) {
      ret comparator.compare(a, b);
    }
  };
}
endif